Non-Fermi liquid phase and linear-in-temperature scattering rate in overdoped two-dimensional Hubbard model

Abstract

SignificanceMost metals display an electron-scattering rate1/τthat follows1/τ∼T2at low temperatures, as prescribed by Fermi liquid theory. But there are important exceptions. One of the most prominent examples is the “strange” metal regime in overdoped cuprate supercondcutors, which exhibits a linearTdependence of the scattering rate1/τ∼Tthat reaches a putative Planckian limit. Here, using cutting-edge computational approaches, we show thatT-linear scattering rate can emerge from the overdoped Hubbard model at low temperatures. Our results agree with cuprate experiments in various aspects but challenge the Planckian limit. Finally, by identifying antiferromagnetic fluctuations as the physical origin of theT-linear scattering rate, we discover the microscopic mechanism of strange metallicity in cuprates.